New tank 3 ' wide x 24" deep.Which plants especially some ground or low types.There are two lighting tubes.

Question

light tubes are 10000k 30w superlight and 15000 30w tri-power

Answer 1

You have to determine the size of your tank and the wattage of your tubes. Let's assume you're going on 0.75 to 1.25 watts per gallon. With this, you can grow many lowlight plants:

java moss: http://www.aquamoss.net/Java-Moss/images/Java-Moss-01.jpg (low/ground)
java fern: http://home.austin.rr.com/mwhitten/images/java%20fern%20big%201024x768.jpg (low/ground)
vallisneria: http://aquavisie.retry.org/Database/Planten/Vallisneria_spiralis.jpg (tall)
amazon swords: http://www.thekrib.com/Plants/Plants/Echinodorus.jpg (tall)
anubias: http://www.aqua-passion.com/fiches_plantes/images/Anubias_glai.2004316185215.jpg (low or tall depending size and type)
pygmy chain sword: http://www.java-plants.com/plantsbig/java_003.jpg (low/ground)
moss ball: http://www.tropical-aquarium-plants.co.uk/images/moss%20ball.jpg (low/ground)
penny wart http://www.introduced-species.co.uk/Images/floating%20pennywort.jpg (planted or floating)

As you get higher wattage (2-3 watts per gallon) you can get into plants like hygro, ludwegia, etc (the red / dark green plants).

Don't discount the tall plants - fish love them, it makes them feel secure.

If you have a local aquarists' society, try getting your plants from them. Many aquatic plants spread like wildfire, and you can obtain cheap/free plants from other hobbiests that may be nicer/bigger than those in petstores.

Answer 2

Glosso is a good plant to cover the bottom of a tank pretty thoroughly as long as the lights are bright enough to reach it. It also tends to work best in sandier soil than looser gravel as it has difficulty spreading out evenly in thick gravel.
http://www.plantedtank.net/plantprofiles/Glosso-Glossostigma-elatinoides/44/

Answer 3

I cant really give you good suggetions without knowing what wattage those lights are.

You could try java moss, anubias, java fern and crypts. They are low light plants and likely will do ok even if your lights are low wattage.